. Author manuscript; available in PMC: 2019 Sep 30.

Published in final edited form as: J Occup Environ Hyg. 2014;11(3):178–185. doi: 10.1080/15459624.2013.848037

TABLE III.

Pairwise multiple comparisons for mean P_filter values among four MIFs and five breathing frequency groups (ANOVA with Tukey’s range test) for a surgical mask

Effect of MIF on P_filter				Effect of Breathing Frequency on P_filter
MIF (L/min)	Tukey Grouping^a	Mean^b P_filter (%)	p-value^c	Breathing Frequency (breaths/min)	Tukey Grouping^a	Mean^b P_filter (%)	p-value^d

15	C	5.41	<0.0001	10	I II	6.97	<0.0143
30	C	6.04		15	I II	7.63
55	B	8.11		20	II	6.67
85	A	9.65		25	I II	7.43
				30	I	7.81

^a:

Within each group of the MIF or the breathing frequency, means with the same letter are not significantly different (p-value > 0.05).

^b:

Calculated using the size-independent (overall) P_filter values.

^c:

P-values were obtained from the two-way ANOVA performed to examine the effect of the MIF on the filter penetration.

^d:

P-values were obtained from the two-way ANOVA performed to examine the effect of the breathing frequency on the filter penetration.